System and method for inductive line synchronization
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Accused Products
Abstract
A synchronization signal generating apparatus and method in which an input circuit is inductively coupled to an alternating current signal line. The input circuit generates a rectified signal. A switch has a switch input and a switch output in which the switch input is electrically connected to the input circuit and is enabled when the voltage of the rectified signal is greater than a predetermined voltage and is disabled when the rectified signal voltage is less than the predetermined voltage. A pulse generating circuit has a pulse generating circuit input and a pulse generating circuit output. The pulse generating circuit input is electrically connected to the switch output. The pulse generating circuit generates a pulse each time the switch is enabled. The synchronization signal generating apparatus is used in a synchronized television display system to signal a video switch to switch the video signal generated by a camera to a monitor based on the occurrence of the synchronization signal.
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Citations
33 Claims
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1-8. -8. (canceled)
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14-20. -20. (canceled)
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21. A synchronized television display system comprising:
- a plurality of cameras generating video signals;
a monitor for displaying a video signal generated by one of said plurality of cameras;
a video selection unit electrically connected to said plurality of cameras and said monitor, for connecting a selected camera from said plurality of cameras to said monitor;
an AC line having an AC signal; and
a synchronization unit comprising an AC line sensing device comprising a core and a coil wrapped around said core for generating a signal corresponding to the AC signal on said AC line and a synchronization circuit connected to said AC line sensing device for providing a synchronization signal to said video selection unit, wherein said AC line is wrapped around said AC line sensing device and said AC line sensing device is not electrically connected to said AC line and said video selection unit switches the video signal generated by a selected camera from said plurality of cameras to said monitor based on the occurrence of the synchronization signal. - View Dependent Claims (9, 10, 11, 12, 13, 22, 23, 24)
- a plurality of cameras generating video signals;
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25. A synchronized television display system comprising:
- a plurality of cameras generating video signals;
a monitor for displaying a video signal generated by one of said plurality of cameras;
a video selection unit electrically connected to said plurality of cameras and said monitor, for connecting a selected camera from said plurality of cameras to said monitor;
an AC line having an AC signal;
a synchronization circuit comprising a toroidal transformer having a core, primary winding, and secondary winding, said AC line being wrapped around said core but not being electrically connected to said primary winding or said secondary winding, said toroidal transformer providing a synchronization signal based on said AC signal and said video selection unit switches the video signal generated by a selected camera from said plurality of cameras to said monitor based on the occurrence of the synchronization signal. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33)
- a plurality of cameras generating video signals;
Specification